DIYPNP throttle tip-in rich enough to bog, and lift goes super lean - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 04-29-2014, 08:40 PM   #1
Junior Member
Thread Starter
 
Join Date: Dec 2008
Location: Ft. Lauderdale, FL
Posts: 273
Total Cats: 7
Default DIYPNP throttle tip-in rich enough to bog, and lift goes super lean

I have made zero changes to the car, but the car is so rich on throttle tip-in that it reads in the 10AFR range and hesitates slightly. Also, I have noticed that when I lift (i.e. coasting) I am getting super lean readings, like 30AFR range. Where would you start looking for the issue, other than a log, I will get a log of the events and upload them as soon as I can.

Background:
1990 Miata
'01+ VVT engine
DIYPNP
VVTuner running the VVT
Toyota COP's
'01+ "Purple" injectors running @ 60psi

Current MSQ:
2014-04-18_16.37.58.msq
MX5RACER is offline   Reply With Quote
Old 04-30-2014, 02:19 AM   #2
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

What wideband are u using that measures 30afr?
triple88a is offline   Reply With Quote
Old 04-30-2014, 09:01 AM   #3
Junior Member
Thread Starter
 
Join Date: Dec 2008
Location: Ft. Lauderdale, FL
Posts: 273
Total Cats: 7
Default

Innovate LC-1 with gauge.
MX5RACER is offline   Reply With Quote
Old 04-30-2014, 09:12 AM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

Lean your tip-in enrichments.
Richen your throttle-lift enrichments.


/thread.



jesus ******* christ.
Braineack is offline   Reply With Quote
Old 04-30-2014, 10:37 AM   #5
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

LC1 maxes out at 21, no?
triple88a is offline   Reply With Quote
Old 04-30-2014, 10:41 AM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

21.35:1
Braineack is offline   Reply With Quote
Old 04-30-2014, 10:45 AM   #7
Elite Member
iTrader: (2)
 
Join Date: Aug 2012
Location: Indianapolis
Posts: 3,325
Total Cats: 235
Default

I get ∞:1 AFR when coasting, what's the big deal about 30:1?
thenuge26 is offline   Reply With Quote
Old 04-30-2014, 10:55 AM   #8
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 15,633
Total Cats: 1,559
Default

Coasting is called overrun. Your injectors will be turned off completely during overrun to conserve fuel and aid with engine braking. This is normal and desirable.

As Brain said, adjust your accel enrichments lower and possibly to taper more quickly as well.
sixshooter is offline   Reply With Quote
Old 04-30-2014, 03:30 PM   #9
Junior Member
Thread Starter
 
Join Date: Dec 2008
Location: Ft. Lauderdale, FL
Posts: 273
Total Cats: 7
Default

Thank you for all your responses.

I just wanted to add that I have been running this set-up for the past two years and it seems like just overnight, I have been having these issues. This is not a new set-up, this is not a change I made to any maps.

Brain, thanks for your hard work... but Jesus ******* Christ... take a chill pill.

I am wondering if I am getting an issue with the Cam sensor or something that has just popped up that would point to this issue. I know this is hard to diagnose without a log, I will have one posted tonight.
MX5RACER is offline   Reply With Quote
Old 04-30-2014, 03:53 PM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

logs will tell


and i refuse to chill so long as all the MS users on this site refuse to tune.


Attached Thumbnails
DIYPNP throttle tip-in rich enough to bog, and lift goes super lean-akzjlqn_460sa.gif  
Braineack is offline   Reply With Quote
Old 04-30-2014, 03:58 PM   #11
Elite Member
iTrader: (2)
 
Join Date: Aug 2012
Location: Indianapolis
Posts: 3,325
Total Cats: 235
Default

Quote:
Originally Posted by Braineack View Post
logs will tell


and i refuse to chill so long as all the MS users on this site refuse to tune.

Brain, my idle goes back and forth from 800rpm to 1200rpm and 12:1 to 16.5:1. How do I fix it without reading anything from MSEXTRA.com?
thenuge26 is offline   Reply With Quote
Old 04-30-2014, 04:00 PM   #12
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

Quote:
Originally Posted by thenuge26 View Post
Brain, my idle goes back and forth from 800rpm to 1200rpm and 12:1 to 16.5:1. How do I fix it without reading anything from MSEXTRA.com?
by dying... by. dying.

Braineack is offline   Reply With Quote
Old 04-30-2014, 04:03 PM   #13
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 782
Default

My LC-1 display reads to 22.0:1. Suck it.
concealer404 is offline   Reply With Quote
Old 04-30-2014, 07:11 PM   #14
Junior Member
Thread Starter
 
Join Date: Dec 2008
Location: Ft. Lauderdale, FL
Posts: 273
Total Cats: 7
Default

MX5RACER is offline   Reply With Quote
Old 05-03-2014, 09:21 PM   #15
Junior Member
Thread Starter
 
Join Date: Dec 2008
Location: Ft. Lauderdale, FL
Posts: 273
Total Cats: 7
Default

Any ideas?
MX5RACER is offline   Reply With Quote
Old 05-04-2014, 09:28 PM   #16
Senior Member
iTrader: (1)
 
Onyxyth's Avatar
 
Join Date: May 2013
Location: Boyertown, PA
Posts: 719
Total Cats: 55
Default

You're hitting the throttle, TPS accel turns on, commands a bunch of pulsewidth, and it goes rich. Looks like a pretty clear cut case of too much AE. No idea why it would change overnight, though. Try lowering it.

Your TPS spends a lot of time at -1. Might want to re calibrate it.

There's also an area in the 18_7_02 log where your spark advance, MAP, and RPM are oscillating while TPS is at -1. Is this you trying to idle? either way, look into the fueling/spark for the cells near 1-1.6k rpm, something is not right.

Those are my thoughts.. good luck
Onyxyth is offline   Reply With Quote
Old 05-05-2014, 10:11 AM   #17
Junior Member
Thread Starter
 
Join Date: Dec 2008
Location: Ft. Lauderdale, FL
Posts: 273
Total Cats: 7
Default

Thanks, for the information. I will take a look at the TPS AE, when I looked at the curves, they still match the previous curves from before this issue started. Yes, the oscillations are trying to return to idle and that area needs work still, but it's a Racecar so idle quality has taken a back-seat. Once fully warm the idle returns and stays pretty close to 1000rpms.

Way back when I swapped the VVT motor in, I was having an issue with throttle hang, and I set the TPS to -1 by calibrating it and then adjusting the the value to ensure that it was returning to 0. I need to re-calibrate it, I just forgot to do that once I got the throttle hang fixed.
MX5RACER is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:44 AM.